Cleveland Cavaliers; Detroit Pistons; Milwaukee Bucks; Indiana Pacers; Southeast; Atlanta Hawks; Charlotte Hornets; Miami Heat; Orlando Magic; Washington Wizards; Southwest; Dallas Mavericks; Houston Rockets; Memphis Grizzlies; New Orleans Pelicans; San Antonio Spurs; Northwest; Denver Nuggets; Minnesota Timberwolves; Oklahoma City Thunder; Portland Trail Blazers; Utah Jazz; Pacific; Golden State Warriors
So a 2,000-square-foot crawl space would need a 40 cfm exhaust fan. It's pulling just a little bit of air from the crawl space. The problem is that you don't really know where the makeup air for the crawl space is coming from. Yes, the code specifies a pathway for air to move into the crawl space from the house, but air doesn't always follow those arrows in the diagrams.
Air is a physical substance which has weight. It has molecules which are constantly moving. Air pressure is created by the molecules moving around. Moving air has a force that will lift kites and balloons up and down. Air is a mixture of different gases; oxygen, carbon dioxide and nitrogen. All things that fly need air. Air has power to push and pull on the birds, balloons, kites and planes.